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Finding the Fourth Proportional to 60,390, 90,601.07 and 20,947.05

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Solution

The fourth proportional to 60,390, 90,601.07 and 20,947.05 is: 31,426.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,390 : 90,601.07 = 20,947.05 : x
  2. Step 2: Convert to fraction form
    60,390/90,601.07 = 20,947.05/x
  3. Step 3: Cross multiply
    60,390x = 90,601.07 × 20,947.05
  4. Step 4: Simplify right side
    60,390x = 1,897,825,038.61
  5. Step 5: Solve for x
    x = 1,897,825,038.61/60,390
  6. Step 6: Final answer
    x = 31,426.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.